Brake shoe



Feb. 23 1926. 1,574,555 J. A. CQNNELLY BRAKE SHOE Filed July 5, 1922 ant'oa:

Guam,

-a railway wheel.

Patented Feb. 23, 1926.

UNITED STATES JAMES A. CONNELLY, OF HAMILTON, OHIO.

BRAKE sHoE.

Application filed July 5,

To all whom-5t may concern:

Be it known that I, JAMES A. CONNELLY, residing at Hamilton, county of Butler, State of Ohio, a citizen of the United States, have'inventcd certain new and useful Improvements in Brake Shoes, of which the following is a specification.

This invention relates to improvements in brake shoes for railway rolling stock and is an improvement of the structure described and claimed in my prior Patent 1,153,154.

The primary object of my invention is the provision of a brake shoe having detachable wear blocks which will stay comparatively 0001, which will be easily insertable and removable and whichwill not become stuck in their slots when they become worn.

' Referring to the drawing where I have illustrated a preferred embodiment of my invention,

Figure 1 is a perspective view of the brake shoe showing two of the three blocks in place one being removed to show the slot structure.

Fig. 2 is a side elevation of the structure shown in Figure 1.

Fig. 3 is an elevational face view illustrating the tapering of the dove tail slots from right to left.

Fig. 4 is a fragmental cross sectional view on the line 4-4: of Fig. 2.

Figs. 5 and 6 are detail perspective views of the wear block.

Like reference characters refer to similar parts throughout the several views.

10 designates the brake shoe and being of a curved shape to fit the wheel tread of In the face of the brake shoe, I have provided pairs of slots 11 and 12, each pair having a raised support portion 13-between them. The slots 11 and 12 are of a dove-tail shape and are tapered from one side to the other. Wear blocks 14 are provided for insertion in the brake shoe body 10. These wear blocks 1 1 are each provided with dove-tails 15 and 16, corresponding to the dove tail slots 11 and 12, respectively. Between the dove-tails 15 and 16 is formed a'slot 17 and so proportioned that its outer wall will engage the outer'surface of the supports 13 whereby the brake shoe can take pressure from the wear-blocks at this point when the wear-blocks are in place and in contact with the wheel. Connecting the dove tails 15 and 16 and extend- 1922. Serial No. 572,989.

ing across the end ofthe slot 17 is a web 18.

(See Fig. 5). This web 18, when the'wear- The tongue 22 and the'adjacent portions of the brake shoe are similar tothe common brake shoe now in use on railway rolling stock, this brake shoe being intended to be interchangeable therewith.

Cutaway portions 25 are provided underneath'the wear blocksin position to communicate with the main channel which passes from end to end of the block and which I have indicated by .the numeral 26.

This permits a circulation of air behind the wear block and in a direction of travel of the wheel. The revolving of the wheel causes the air to circulate in the channels 25 and 26, under the block and into the opening 20.

In use, the wear-blocks of my brake-shoe are easily inserted, it not being necessary to drive them into place. Normally, the brake shoe in operation hangs slightly away from the surface of the wheel. But since the flange of the wheel is on the side from which the wear-blocks are inserted, the flange will prevent the falling out of the blocks. However, if found to be desirable, the blocks may be so fitted that they may b1e driven tightly into place in the dove-tail sets.

The brake shoe body and the weanbloclrs may be made of any suitable material.

It will be clear from the construction that the wear blocks can keep very much cooler than the ordinary block due to the fact that the construction permits the air to cool a large surface on the blocks. A circulation of air is permitted not only between the blocks themselves, but to the interior and rear of the block.

It has been found in actual practice that trains can be stopped, due to the fact that the brakes are kept cool, with a small fraction of the air pressure, required by the usual brake construction.

' invention and within the scope of the appended claims. Y

Having described my invention, what I claim 1s 1. A brake shoe having a mam body and i a plurality of detachable wear-blocks, coacting means between the main body and the blocks, comprising tapered dove-talls and slots therefor and means on the main body for supporting the block adjacent its middle portion, each of the wear-blocks having a passage forair at its rear and adjacent the main body of the shoe.

2. A brake shoe having a main body and a plurality of detachable wear-blocks, coacting means between the main body and the blocks, comprising tapered dove-tails and slots therefor, and means onthe main body for supporting the block adjacent its middle portion, each of the wear-blocks having a passage for air at its rear and adjacent the main body of the shoe, the openin at the end of the passage behind one block being adjacent the opening of the passage of the adjacent block. 3. A brake shoe having a main body and a plurality of detachable Wear-blocks, coacting means between the main body and each block, comprising two dove-tail slots in the body portion and two dove-tails on the block, the block clove-tailed portion forming the greater portion of the side of the block next the main body.

4. A brake shoe having a main body and a plurality of detachable wear-blocks, one of the blocks having an opening through it self, the body portion and blocks being so shaped as to form a communication between the inner end of the opening and the outside air when the brake shoe is in contact with the Wheel.

5. A brake shoe having a main body and a plurality of detachable wear-blocks, one of the wear blocks having an opening through itself, the body portion and block being so shaped as to form a communication both between the inner end of the opening and the outside air and also between the outer end of the opening and the outside air when the wear-block is in contact with the wheel.

In testimony whereof I hereunto aifix my signature.

J AMES A. CONNELLY. 

